| 摘要 |
A rate control unit performs data truncation on a code sequence having been sorted and bit shifted as shown in FIG. 10 so that a desired noise reduction effect is achieved. The data truncation occurs in sequence from the rightmost bit. For example, in FIG. 10 , data is truncated from data of bit 0 in a subband VHL 4 downwardly in sequence through data of bit 0 in a subband YHH 5 , and so on. If the desired noise reduction effect can be achieved by truncation of up to bit data in the subband YHH 1 , data in those subbands in a dotted area in FIG. 10 will be truncated. If the desired noise reduction effect cannot be achieved by truncation of up to bit data in the subband YHH 1 , data will then be truncated from data of bit 0 in a subband VLL 4 downwardly in sequence.
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